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In tray A the temperature of the soiling is cooling because of heat transfer between the soil and surrounding air (and container). Energy moves from objects that have higher temperature to objects that have lower temperature. This transfer of energy is called conduction. The fan helps to introduce fresh cooler air causing the constant slow temperature decline of the soil.
In tray B, we introduce water into the equation. The heat transfer takes place between the water and soil (and, initially, to a lesser degree the surrounding air) as there is greater contact with between the soil and water in comparison to the soil and air. From the chart, we can infer that the water introduced has a significant lower temperature than the soil thereby causing the overall soil temperature to drop. We also observe that the temperature, over time, stabilises suggesting that the various objects (soil, water, air, container) have reached a temperature equilibrium.
Note: In science we learn that heat transfer can never be stopped and can only be slowed down. This is a part of the law of conservation of energy.
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